Karteikarten
Speed
Karten in diesem Stapel (41)
- 1What are waves?*a disturbance that transfers energy from one place to another.
*can transfer energy over a distance without moving matter the entire distance.(only moves energy not matter)
*it is the disturbance that travels in a wave, transferring energy.
*a force is required to change the motion on an object. - 2how does a wave move?a wave needs a medium in order to move
- 3mediumany substance that a wave moves through. it can be a solid, liquid or a gas.2
- 4mediums*water is the medium
*air is the medium for the music
*the earth is the medium for the earthquake. - 5lightlight does not require a medium
light can travel from the sun to the earth across the empty space between them.
*light waves are also called electromagnetic waves. - 6Mechanical Wavesany wave that moves through matter is known as a mechanical waves.
*are produced when a source of energy causes a medium to vibrate.
*a vibration is a repeated back and forth or up and down motion. when a vibration moves through a medium, a wave results. - 7Types Of Mechanical WavesTransverse and longitudinal wave
- 8Transverse Wavethe disturbance moves at right angles, perpendicular, to the direction in which the waves travels.
(means across) - 9Longitudinal wavesthe back and forth motion of the coll of the spring is in the same direction that the waves travel.
the wave travels the same way as the disturbance. - 10properties of waveswaves have amplitude, wavelength, and frequency.
- 11Crest and TroughsA crest is the highest point or peak of a waves
A trough is the lowest point or valley of wave. - 12Wave lengththe distance from one wave crest to the next crest, or from one through the trough
- 13amplitudethe distance from one wave crest to the next crest, or a trough.
it tells how much energy a wave is carrying.
the larger the amplitude the more energy to wave has. - 14Frequencythe number of waves passing a fixed point in a certain amount of time.
- 15How often a wave occurs?measures by counting how many crest or troughs pass a given point in one second
- 16How are frequency and wavelength related ?when frequency increases, wavelength decreases
when frequency decreases, wavelength increases - 17How do waves behaves?waves interact with materials in three ways
reflection, refraction, diffraction. - 18Reflectionthe bouncing back of a wave after it strikes barrier. sound waves and light waves reflect too.
- 19Refractionthe bending of a wave as it enters a new medium (solid, liquid gas) at an angle other than 90 degrees
this happens because waves travel at different speeds in different mediums
travel faster in air(gas),slower in water and slower in a solid. - 20Diffractionthe spreading out of waves through an opening or around the edge of an obstacle. occurs with all waves
- 21Constructive Inferencewhen waves meet and combine. the waves build up and constructs a larger wave
- 22destructive interferencewhen the crest on one wave meets the trough of another wave, they cancel each other out.
- 23wavelength formulawavelength=speed/frequency
- 24Frequency formulafrequency=speed/wavelength
- 25speed formulawavelength*frequency
- 26The Law of Refractionwhen a light ray travels from one medium, like air, to a denser medium, like water, the light will bend toward the normal line. when the light exits the denser medium into a less dense medium, it will bend away from the normal line. the new direction of the light ray is called the angle of refraction
- 27The Law of Reflectiona ray is the line that represents the path of a beam of light. when an incident ray of light hits a certain material that is smooth, it is reflected at a certain angle
- 28Speedsound speed varies, depending on medium.
-travel fastest in solids, slowest in gases.
-travel fastest in the most dense media - 29intensitythe amount of energy that flows through a certain area in specific amount of the time.
measured in decibels
amplitude is related to the density of particles in the compression and rarefaction - 30Sound intensity depends on-amplitude
-distance from source - 31Loudnessit depends on the person who is hearing it.
*loudness is a personal, physical response to the intensity of sound.
*as intensity increases, so does loudness but loudness also depends on the listener's ears and brain - 32Frequency & Pitch*frequency of a sound wave depends on how fast the source of the sound is vibrating.
*pitch is how we hear frequency of sound waves.
*pitch depends on frequency...high frequency sounds are high pitched, and low frequency sounds are low pitched. - 33Electromagnetic wavesdo not need matter to transfer energy are made by vibrating electric charges and can travel through space by transferring energy between vibrating electric and magnetic fields.
- 34Electricitycharging by friction happens when electrons are wiped from one object onto another.
charging by conduction happens when electrons move from one subject to another by direct contact or a speak, - 35static electricityelectric charges that can be confined to an object
electricity at rest. - 36Frictioncan cause change separation
electrons are stripped from one material and added to the other - 37conductermaterial through which electrons move freely.
- 38insulatormaterial through which electrons do not move freely
- 39groundingremoving a static charge by providing a path to the ground
- 40To put a static charge on a conductor*isolate it
*use an insulator to seperate it from the ground - 41electric charge---charge by friction
" " conduction-direct- contact
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- Middle Science (quizes) Karteikarten am Speed, erstellt von httpcalumhood am 12/12/2015.
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